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zfs.go
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zfs.go
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package zfs
import (
"path/filepath"
"strconv"
"strings"
"github.com/influxdb/telegraf/internal"
"github.com/influxdb/telegraf/plugins"
)
type Zfs struct {
KstatPath string
KstatMetrics []string
}
var sampleConfig = `
# ZFS kstat path
# If not specified, then default is:
# kstatPath = "/proc/spl/kstat/zfs"
#
# By default, telegraf gather all zfs stats
# If not specified, then default is:
# kstatMetrics = ["arcstats", "zfetchstats", "vdev_cache_stats"]
`
func (z *Zfs) SampleConfig() string {
return sampleConfig
}
func (z *Zfs) Description() string {
return "Read metrics of ZFS from arcstats, zfetchstats and vdev_cache_stats"
}
func getTags(kstatPath string) map[string]string {
var pools string
poolsDirs, _ := filepath.Glob(kstatPath + "/*/io")
for _, poolDir := range poolsDirs {
poolDirSplit := strings.Split(poolDir, "/")
pool := poolDirSplit[len(poolDirSplit)-2]
if len(pools) != 0 {
pools += "::"
}
pools += pool
}
return map[string]string{"pools": pools}
}
func (z *Zfs) Gather(acc plugins.Accumulator) error {
kstatMetrics := z.KstatMetrics
if len(kstatMetrics) == 0 {
kstatMetrics = []string{"arcstats", "zfetchstats", "vdev_cache_stats"}
}
kstatPath := z.KstatPath
if len(kstatPath) == 0 {
kstatPath = "/proc/spl/kstat/zfs"
}
tags := getTags(kstatPath)
for _, metric := range kstatMetrics {
lines, err := internal.ReadLines(kstatPath + "/" + metric)
if err != nil {
return err
}
for i, line := range lines {
if i == 0 || i == 1 {
continue
}
if len(line) < 1 {
continue
}
rawData := strings.Split(line, " ")
key := metric + "_" + rawData[0]
rawValue := rawData[len(rawData)-1]
value, _ := strconv.ParseInt(rawValue, 10, 64)
acc.Add(key, value, tags)
}
}
return nil
}
func init() {
plugins.Add("zfs", func() plugins.Plugin {
return &Zfs{}
})
}